// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_CAPTURER_SOURCE_H_
#define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_CAPTURER_SOURCE_H_

#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/thread_checker.h"
#include "content/common/media/video_capture.h"
#include "content/public/renderer/render_frame_observer.h"
#include "content/renderer/media/media_stream_video_source.h"

namespace media {
class VideoCapturerSource;
} // namespace media

namespace content {

// Representation of a video stream coming from a camera, owned by Blink as
// WebMediaStreamSource. Objects of this class are created and live on main
// Render thread. Objects can be constructed either by indicating a |device| to
// look for, or by plugging in a |source| constructed elsewhere.
class CONTENT_EXPORT MediaStreamVideoCapturerSource
    : public MediaStreamVideoSource,
      public RenderFrameObserver {
public:
    MediaStreamVideoCapturerSource(
        const SourceStoppedCallback& stop_callback,
        std::unique_ptr<media::VideoCapturerSource> source);
    MediaStreamVideoCapturerSource(const SourceStoppedCallback& stop_callback,
        const StreamDeviceInfo& device_info,
        RenderFrame* render_frame);
    ~MediaStreamVideoCapturerSource() override;

private:
    friend class CanvasCaptureHandlerTest;
    friend class MediaStreamVideoCapturerSourceTest;

    // MediaStreamVideoSource overrides.
    void RequestRefreshFrame() override;
    void OnHasConsumers(bool has_consumers) override;
    void OnCapturingLinkSecured(bool is_secure) override;
    void GetCurrentSupportedFormats(
        int max_requested_width,
        int max_requested_height,
        double max_requested_frame_rate,
        const VideoCaptureDeviceFormatsCB& callback) override;
    void StartSourceImpl(
        const media::VideoCaptureFormat& format,
        const blink::WebMediaConstraints& constraints,
        const VideoCaptureDeliverFrameCB& frame_callback) override;
    void StopSourceImpl() override;

    // RenderFrameObserver implementation.
    void OnDestruct() final { }

    // Method to bind as RunningCallback in VideoCapturerSource::StartCapture().
    void OnRunStateChanged(bool is_running);

    const char* GetPowerLineFrequencyForTesting() const;

    // The source that provides video frames.
    const std::unique_ptr<media::VideoCapturerSource> source_;

    // Indicates whether the capture is in starting. It is set to true by
    // StartSourceImpl() when starting the capture, and is reset after starting
    // is completed.
    bool is_capture_starting_ = false;

    DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoCapturerSource);
};

} // namespace content

#endif // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_CAPTURER_SOURCE_H_
